/*
 * fnmatch.
 * Match files in the current directory to a pattern passed as a parameter. 
 * usage: fnmatch <patther>
 *
 * E.g.
 * fnmatch "*.c"
 *
 * Make sure to enclose the pattern paramter in quotes so the shell does not interpret characters such as '*'.
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <fnmatch.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
	struct dirent **entries;
	int i;
	int nument;
	int ret;

	if(argc!=2)
	{
		fprintf(stderr,"usage: %s <pattern>\n",argv[0]);
		fflush(stderr);
		return 1;
	}

	if((nument=scandir(".",&entries,NULL,alphasort))==-1)
	{
		fprintf(stderr,"scandir failed, %s\n",strerror(errno));
		fflush(stderr);	
		return 1;
	}


	for(i=0; i<nument; i++)
	{
		if((ret=fnmatch(argv[1],entries[i]->d_name,FNM_PATHNAME))==FNM_NOMATCH)		/*compare each file to the pattern*/
		{
			continue;
		}
		else if(ret==0)
		{
			fprintf(stdout,"%s\n",entries[i]->d_name);
			fflush(stdout);
		}
		else
		{
			fprintf(stderr,"fnmatch failed, %s\n",strerror(errno));
			fflush(stderr);
		}
	}

	for(i=0; i<nument; i++)
	{
		free(entries[i]);
	}

	free(entries);

	return 0;
}